/*
  Copyright (C) 2008-2011 Jeroen Frijters

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.

  Jeroen Frijters
  jeroen@frijters.net
  
*/
using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using IKVM.Reflection.Writer;
using IKVM.Reflection.Metadata;

namespace IKVM.Reflection.Emit
{
	public sealed class PropertyBuilder : PropertyInfo
	{
		private readonly TypeBuilder typeBuilder;
		private readonly string name;
		private PropertyAttributes attributes;
		private PropertySignature sig;
		private MethodBuilder getter;
		private MethodBuilder setter;
		private readonly List<Accessor> accessors = new List<Accessor>();
		private int lazyPseudoToken;
		private bool patchCallingConvention;

		private struct Accessor
		{
			internal short Semantics;
			internal MethodBuilder Method;
		}

		internal PropertyBuilder(TypeBuilder typeBuilder, string name, PropertyAttributes attributes, PropertySignature sig, bool patchCallingConvention)
		{
			this.typeBuilder = typeBuilder;
			this.name = name;
			this.attributes = attributes;
			this.sig = sig;
			this.patchCallingConvention = patchCallingConvention;
		}

		internal override PropertySignature PropertySignature
		{
			get { return sig; }
		}

		public void SetGetMethod(MethodBuilder mdBuilder)
		{
			getter = mdBuilder;
			Accessor acc;
			acc.Semantics = MethodSemanticsTable.Getter;
			acc.Method = mdBuilder;
			accessors.Add(acc);
		}

		public void SetSetMethod(MethodBuilder mdBuilder)
		{
			setter = mdBuilder;
			Accessor acc;
			acc.Semantics = MethodSemanticsTable.Setter;
			acc.Method = mdBuilder;
			accessors.Add(acc);
		}

		public void AddOtherMethod(MethodBuilder mdBuilder)
		{
			Accessor acc;
			acc.Semantics = MethodSemanticsTable.Other;
			acc.Method = mdBuilder;
			accessors.Add(acc);
		}

		public void SetCustomAttribute(ConstructorInfo con, byte[] binaryAttribute)
		{
			SetCustomAttribute(new CustomAttributeBuilder(con, binaryAttribute));
		}

		public void SetCustomAttribute(CustomAttributeBuilder customBuilder)
		{
			if (customBuilder.KnownCA == KnownCA.SpecialNameAttribute)
			{
				attributes |= PropertyAttributes.SpecialName;
			}
			else
			{
				if (lazyPseudoToken == 0)
				{
					lazyPseudoToken = typeBuilder.ModuleBuilder.AllocPseudoToken();
				}
				typeBuilder.ModuleBuilder.SetCustomAttribute(lazyPseudoToken, customBuilder);
			}
		}

		public override object GetRawConstantValue()
		{
			if (lazyPseudoToken != 0)
			{
				return typeBuilder.ModuleBuilder.Constant.GetRawConstantValue(typeBuilder.ModuleBuilder, lazyPseudoToken);
			}
			throw new InvalidOperationException();
		}

		public override PropertyAttributes Attributes
		{
			get { return attributes; }
		}

		public override bool CanRead
		{
			get { return getter != null; }
		}

		public override bool CanWrite
		{
			get { return setter != null; }
		}

		public override MethodInfo GetGetMethod(bool nonPublic)
		{
			return nonPublic || (getter != null && getter.IsPublic) ? getter : null;
		}

		public override MethodInfo GetSetMethod(bool nonPublic)
		{
			return nonPublic || (setter != null && setter.IsPublic) ? setter : null;
		}

		public override MethodInfo[] GetAccessors(bool nonPublic)
		{
			List<MethodInfo> list = new List<MethodInfo>();
			foreach (Accessor acc in accessors)
			{
				AddAccessor(list, nonPublic, acc.Method);
			}
			return list.ToArray();
		}

		private static void AddAccessor(List<MethodInfo> list, bool nonPublic, MethodInfo method)
		{
			if (method != null && (nonPublic || method.IsPublic))
			{
				list.Add(method);
			}
		}

		public override Type DeclaringType
		{
			get { return typeBuilder; }
		}

		public override string Name
		{
			get { return name; }
		}

		public override Module Module
		{
			get { return typeBuilder.Module; }
		}

		public void SetConstant(object defaultValue)
		{
			if (lazyPseudoToken == 0)
			{
				lazyPseudoToken = typeBuilder.ModuleBuilder.AllocPseudoToken();
			}
			attributes |= PropertyAttributes.HasDefault;
			typeBuilder.ModuleBuilder.AddConstant(lazyPseudoToken, defaultValue);
		}

		internal void Bake()
		{
			if (patchCallingConvention)
			{
				sig.HasThis = !this.IsStatic;
			}

			PropertyTable.Record rec = new PropertyTable.Record();
			rec.Flags = (short)attributes;
			rec.Name = typeBuilder.ModuleBuilder.Strings.Add(name);
			rec.Type = typeBuilder.ModuleBuilder.GetSignatureBlobIndex(sig);
			int token = 0x17000000 | typeBuilder.ModuleBuilder.Property.AddRecord(rec);

			if (lazyPseudoToken == 0)
			{
				lazyPseudoToken = token;
			}
			else
			{
				typeBuilder.ModuleBuilder.RegisterTokenFixup(lazyPseudoToken, token);
			}

			foreach (Accessor acc in accessors)
			{
				AddMethodSemantics(acc.Semantics, acc.Method.MetadataToken, token);
			}
		}

		private void AddMethodSemantics(short semantics, int methodToken, int propertyToken)
		{
			MethodSemanticsTable.Record rec = new MethodSemanticsTable.Record();
			rec.Semantics = semantics;
			rec.Method = methodToken;
			rec.Association = propertyToken;
			typeBuilder.ModuleBuilder.MethodSemantics.AddRecord(rec);
		}

		internal override bool IsPublic
		{
			get
			{
				foreach (Accessor acc in accessors)
				{
					if (acc.Method.IsPublic)
					{
						return true;
					}
				}
				return false;
			}
		}

		internal override bool IsNonPrivate
		{
			get
			{
				foreach (Accessor acc in accessors)
				{
					if ((acc.Method.Attributes & MethodAttributes.MemberAccessMask) > MethodAttributes.Private)
					{
						return true;
					}
				}
				return false;
			}
		}

		internal override bool IsStatic
		{
			get
			{
				foreach (Accessor acc in accessors)
				{
					if (acc.Method.IsStatic)
					{
						return true;
					}
				}
				return false;
			}
		}

		internal override bool IsBaked
		{
			get { return typeBuilder.IsBaked; }
		}

		internal override int GetCurrentToken()
		{
			if (typeBuilder.ModuleBuilder.IsSaved && ModuleBuilder.IsPseudoToken(lazyPseudoToken))
			{
				return typeBuilder.ModuleBuilder.ResolvePseudoToken(lazyPseudoToken);
			}
			else
			{
				return lazyPseudoToken;
			}
		}
	}
}
